クロロプレンゴムの電歪
1972 年 41 巻 5 号 p. 461-467
詳細
1972 年 41 巻 5 号 p. 461-467
The large values of electrostrictive constant of chloroprene rubber (CR) become still larger by mixing it with carbon blacks.
The values are found to be nearly proportional to, but always larger than, the square of the dielectric cnstant. The experimental results can be explained by taking into consideration the Lorentz field which acts on the dipoles of CR. When uniformity of mixture of CR and carbon black is not maintained, the effective dielectric constant of CR may vary at random as a function of the position of CR within the sample. Because electrostriction is a phenomenon which depends on the square of the electric fields, the value of the electrostrictive constant must be proportional to the sum of the mean square value and the variance of the electric field. Accordingly, an electrostrictive constant as large as 10-5 cgs esu can be obtained by a proper choice of the mixing ratio and mixing process of chloroprene and carbon blacks. The material can be given very high sensitive piezoelectric properties with the aid of a DC bias.
